Prism calcite

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Calcite Prism is characterized with a transparent to opaque appearance, which exhibits MOhs hardness of 3 and specific gravity of 2.71. These crystals are trigonal-rhombohedral and rarely occur as natural crystals. These crystals may occur as granular, fibrous, lamellar, or compact. The most common color of these crystals is white or none. However, shades of gray, red, orange, yellow, green, blue, violet, brown, or even black may occur when the mineral is charged with impurities. These crystals display an optical property called birefringence (double refraction). Under this impact, the object viewed by through Calcite Prism tends to appear double. This effect was first described by the Danish scientist Rasmus Bartholin in 1669.

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